diff --git a/gc/ogc/system.h b/gc/ogc/system.h
index 08aca2d1..5be7f46f 100644
--- a/gc/ogc/system.h
+++ b/gc/ogc/system.h
@@ -267,6 +267,7 @@ void SYS_Init(void);
 void* SYS_AllocateFramebuffer(GXRModeObj *rmode);
 
 
+bool SYS_IsDMAAddress(const void *addr);
 void SYS_ProtectRange(u32 chan,void *addr,u32 bytes,u32 cntrl);
 void SYS_StartPMC(u32 mcr0val,u32 mcr1val);
 void SYS_DumpPMC(void);
diff --git a/libogc/dvd.c b/libogc/dvd.c
index f8fbc22b..e2725ae6 100644
--- a/libogc/dvd.c
+++ b/libogc/dvd.c
@@ -3172,7 +3172,7 @@ static bool __gcdvd_ReadSectors(sec_t sector,sec_t numSectors,void *buffer)
 
 	if(sector & ~0x7fffff) return false;
 	if(numSectors & ~0x1fffff) return false;
-	if((u32)buffer & 0x1f) return false;
+	if(!SYS_IsDMAAddress(buffer)) return false;
 
 	if(DVD_ReadAbs(&blk, buffer, numSectors << 11, sector << 11) < 0)
 		return false;
@@ -3233,7 +3233,7 @@ static bool __gcode_ReadSectors(sec_t sector,sec_t numSectors,void *buffer)
 
 	if((u32)sector != sector) return false;
 	if(numSectors & ~0x7fffff) return false;
-	if((u32)buffer & 0x1f) return false;
+	if(!SYS_IsDMAAddress(buffer)) return false;
 
 	if(DVD_GcodeRead(&blk, buffer, numSectors << 9, sector) < 0)
 		return false;
@@ -3247,7 +3247,7 @@ static bool __gcode_WriteSectors(sec_t sector,sec_t numSectors,const void *buffe
 
 	if((u32)sector != sector) return false;
 	if((u32)numSectors != numSectors) return false;
-	if((u32)buffer & 0x1f) return false;
+	if(!SYS_IsDMAAddress(buffer)) return false;
 
 	if(DVD_GcodeWrite(&blk, buffer, numSectors, sector) < 0)
 		return false;
diff --git a/libogc/gcsd.c b/libogc/gcsd.c
index e98a83f6..c66f648d 100644
--- a/libogc/gcsd.c
+++ b/libogc/gcsd.c
@@ -84,6 +84,7 @@ static bool __gcsd_writeSectors(int n, sec_t sector, sec_t numSectors, const voi
 
 	if((u32)sector != sector) return false;
 	if((u32)numSectors != numSectors) return false;
+	if(!SYS_IsDMAAddress(buffer)) return false;
 
 	if(numSectors == 1)
 		ret = sdgecko_writeSector(n, buffer, sector);
diff --git a/libogc/system.c b/libogc/system.c
index 206c499f..13352b5d 100644
--- a/libogc/system.c
+++ b/libogc/system.c
@@ -1494,6 +1494,18 @@ void SYS_ProtectRange(u32 chan,void *addr,u32 bytes,u32 cntrl)
 	}
 }
 
+bool SYS_IsDMAAddress(const void *addr)
+{
+	if((u32)addr&0x1F) return false;
+	if((u32)addr>=0x80000000 && (u32)addr<0x84000000) return true;
+	if((u32)addr>=0xC0000000 && (u32)addr<0xC4000000) return true;
+#if defined(HW_RVL)
+	if((u32)addr>=0x90000000 && (u32)addr<0xA0000000) return true;
+	if((u32)addr>=0xD0000000 && (u32)addr<0xE0000000) return true;
+#endif
+	return false;
+}
+
 void* SYS_AllocateFramebuffer(GXRModeObj *rmode)
 {
 	return memalign(32, VIDEO_GetFrameBufferSize(rmode));
diff --git a/libogc/wiisd.c b/libogc/wiisd.c
index 9151a577..5af6547d 100644
--- a/libogc/wiisd.c
+++ b/libogc/wiisd.c
@@ -39,6 +39,7 @@
 #include <time.h>
 #include <gcutil.h>
 #include <ogc/ipc.h>
+#include <ogc/system.h>
 #include <unistd.h>
 #include <ogc/disc_io.h>
 #include <sdcard/wiisd_io.h>
@@ -539,7 +540,7 @@ static bool sdio_ReadSectors(sec_t sector, sec_t numSectors,void* buffer)
 
 	if((u32)sector != sector) return false;
 	if(numSectors & ~0x7fffff) return false;
-	if((u32)buffer & 0x1f) return false;
+	if(!SYS_IsDMAAddress(buffer)) return false;
 
 	ret = __sd0_select();
 	if(ret<0) return false;
@@ -558,7 +559,7 @@ static bool sdio_WriteSectors(sec_t sector, sec_t numSectors,const void* buffer)
 
 	if((u32)sector != sector) return false;
 	if(numSectors & ~0x7fffff) return false;
-	if((u32)buffer & 0x1f) return false;
+	if(!SYS_IsDMAAddress(buffer)) return false;
 
 	ret = __sd0_select();
 	if(ret<0) return false;